Car sales tax in Union County, Ohio
Buying a car in Union County, Ohio, the combined state and local sales tax rate is 7%. On a $35,000 car that's about $2,450 in tax; with a $10,000 trade-in, about $1,750.
These are the figures the Before the Lot planner and its AI connector use for Union County, with their sources. They describe the rates and the arithmetic; they are not tax advice, and the dealer's quote and the state's documents are what count.
How the rate is made up
Union County: 7% combined state and local rate (Ohio's rate file, rates as of 2026-10-01). That is the rate outside Union County's cities. Parts of Union County are in special districts with their own rate.
Union County includes Marysville, Richwood, Milford Center, Plain City, Magnetic Springs, Unionville Center and other cities and villages. Ohio taxes a car at the rate of the county the buyer lives in, so a buyer anywhere in Union County pays 7%.
Out-the-door examples in Union County
Worked with the planner's own out-the-door math for a new car, the same numbers the connector gives an AI assistant.
| Line | $35,000 car, $10,000 trade-in | $50,000 car, no trade-in |
|---|---|---|
| Vehicle price | $35,000 | $50,000 |
| Doc fee (see below) | $398 | $398 |
| Sales tax at 7% | $2,450 | $3,500 |
| Title and registration (a placeholder) | $250 | $250 |
| Out the door, as dealers quote it | $38,098 | $54,148 |
| Tax saved by the trade-in credit | $700 | — |
| Out the door after the trade-in credit | $37,398 | — |
The trade-in's value itself comes off what's financed or paid, not shown here. Title and registration differ by vehicle; $250 is the planner's placeholder, not an Ohio figure.
Doc fee and trade-in in Ohio
- The examples use Ohio's doc-fee cap, $398 (Ohio Rev. Code 4517.261 (as amended by SB 94, eff. Oct 24, 2024); 1317.07); a dealer's own fee may be lower.
- A trade-in lowers the taxed price in Ohio: tax is on the price less the trade-in.
- A maker's rebate doesn't lower the taxed price.
Every rule for the state, with sources: Ohio car-buying rules.
Other places in Ohio
- Franklin County: 8%
- Cuyahoga County: 8%
- Columbus: 8%
- Hamilton County: 7.8%
- Summit County: 6.75%
- Montgomery County: 7.5%
Work out your own deal
Open the planner with Union County filled in
Change the price, trade-in and fees to your own. Nothing is sent to a server; the numbers ride in the link. In Claude or ChatGPT, add the connector and ask about Union County by name.
Questions
What is the car sales tax rate in Union County, Ohio?
Buying a car in Union County, Ohio, the combined state and local sales tax rate is 7%. On a $35,000 car that's about $2,450 in tax; with a $10,000 trade-in, about $1,750.
What's the out-the-door price of a $50,000 car in Union County?
About $54,148: the $50,000 price, a $398 doc fee, $3,500 in sales tax and a $250 placeholder for title and registration. A dealer's itemized quote is what counts.
Does a trade-in lower the sales tax in Union County?
Yes. Ohio taxes the price less the trade-in, so a $10,000 trade-in on a $35,000 car lowers the tax by about $700.
Is the Union County rate charged on the dealer's address or mine?
Ohio's local tax on a car goes by where the buyer lives (the address the car is registered to). Ohio's own lookup by address: https://thefinder.tax.ohio.gov/
Which towns are in Union County?
Union County includes Marysville, Richwood, Milford Center, Plain City, Magnetic Springs, Unionville Center and other cities and villages. Ohio taxes a car at the rate of the county the buyer lives in, so a buyer anywhere in Union County pays 7%.